using System;
using System.IO.Pipes;
using System.Threading;
using System.Threading.Tasks;
using FFMpegCore.Pipes;

namespace FFMpegCore.Arguments
{
    /// <summary>
    /// Represents input parameter for a named pipe
    /// </summary>
    public class InputPipeArgument : PipeArgument, IInputArgument
    {
        public readonly IPipeSource Writer;

        public InputPipeArgument(IPipeSource writer) : base(PipeDirection.Out)
        {
            Writer = writer;
        }

        public override string Text => $"{Writer.GetStreamArguments()} -i \"{PipePath}\"";

        protected override async Task ProcessDataAsync(CancellationToken token)
        {
            await Pipe.WaitForConnectionAsync(token).ConfigureAwait(false);
            if (!Pipe.IsConnected)
                throw new OperationCanceledException();
            await Writer.WriteAsync(Pipe, token).ConfigureAwait(false);
        }
    }
}